A memorial to the “Little Rock 9,” students who integrated the Little Rock schools in Arkansas on Sept. 23, 1957, following the Supreme Court’s decision in Brown v. Board of Education of Topeka. Photo by Steve Snodgrass via flickr.com

After more than half a century, the U.S.’s efforts to end segregation are winding down. In the years after Brown v. Board of Education, 755 school districts were under desegregation orders. But, according to a new study conducted by Stanford’s Sean Reardon and his colleagues, that number had dropped to 268 by 2009.